Must ship your complete upper with bolt assembly, cam pin, retaining pin, charging handle, and firing pin. Please remove bolt carrier, gas block, and DI handguards. If you are using a piston compatible rail please include in the package as all Free Float Rails must be installed before the gas block is installed.

Combat Adaptive Piston System Features:

4 Position Regulator

Pull Through Gas Block

Ambi-Regulator Knob

360° Continuous Rotation

Easily Adjustable with One Hand

Easily Adjustable with Gloves On

Easily Adjustable from Firing Position

Audible and Palpable Setting Confirmation

No Tools Required to Adjust Gas Regulator

No Detent Pin to Push Into Adjust Gas Regulator

Regulator Knob Allows for Zero Visibility Adjustment

Interlocking Mechanism Prevents Accidental Rotation of Knob

Knob Configured for Rapid Adjustment with No Loss of Target Engagement